Aryl　diketo　acid　derivatives　are　one　of　the　most　promising　HIV-1　integrase(IN)　inhibitors.　With　a　view　to　substitute　the　critical　diketo　acid　pharmacophore　with　the　diketo　benzimidazole　unit,　the　coupling　reaction　of　compound　4　with　o-phenylenediamine　was　carried　out.　However,　the　reaction　product,　compound　5,　was　confirmed　to　be　3-{[3(phenylsulfonamido)　benzoyl]　methylidene}-3,4-dihydroquinoxaline-2　(H-1)-one　rather　than　the　2-benziniidazole　derivative　by　using　X-ray　diffraction.　Owing　to　its　low　solubility　in　water,　the　evaluation　of　the　anti-HIV　IN　activity　of　the　synthesized　compound　5　could　not　be　carried　out.　Consequently,　the　ion-binding　properties　of　compound　5　in　the　absence　of　HIV-1　IN　were　investigated　with　UV-Vis　spectroscopy　in　organic　solvents.　The　results　show　that　such　a　compound　can　selectively　recognize　Cu2+.